No glue, no nuts, no screws, easy to print, nice to use tickling fingers!

There are three sets of gears here:

1. Spur gears
2. Helical gears
3. Herringbone gears

To achieve the result you need to print:

side1 - print one side2 - print one set1 or set2 or set3 - print what you like (three gears)

It's recommended to use filament of different colors for gears and sides.

PETG, ABS, PLA - good choice for the thing filament

Creality, TEVO, Prusa, Anycubic, Wanhao, Reprap, Ultimaker - 100% printable with good result.

I use Ender 3 (with standard hotend 0.4) and about 1 hour to print this model.

You can use a thinner nozzle and layer height to archive maximum accuracy

May be you need sandpaper or nailfile to smooth edges.

You can also use another antistress toys I made:

https://www.thingiverse.com/thing:4855514 https://www.thingiverse.com/thing:4854632 https://www.thingiverse.com/thing:4857857